GIS; KUERY algorithm; Microcatchment; MPSIAC model; Water erosion algorithm; assessment method; catchment; erodibility; erosion rate; GIS; sediment yield; semiarid region; soil erosion; water erosion; Mexico [North America]
Improved MPSIAC model for soil erosion rate assessment in semiarid zones
Erosion of soil by water is one of the most significant forms of soil degradation. The validity of the Modified Pacific South-West Inter-Agency Committee (MPSIAC) model for assessment of soil erosion rates has been demonstrated in many countries. We propose an improved version of the MPSIAC model to determine the erosion rate and expected sediment yield in two scenarios, conservative and adverse. Three microcatchments were selected from an arid semi-desert biome in Mexico, chosen for their advanced state of soil erosion by water and soil degradation. The improvements introduced to the MPSIAC model made field and laboratory work easier and can improve the methodology used for management of watersheds with similar conditions anywhere in the world. The improvements are related to selecting the microcatchment size, adding new categorization level of sediment yield, and calculating the time of rain concentration and modified erodibility factor K. The sensitivity analysis showed that runoff, surface erosion and channel erosion parameters are the most significant and soil factor K is the least sensitive parameter of the model. The improvements will support decision-making processes and selection of control practices that are best suited to the particular needs of each site and to preventing soil erosion risks. © 2023 Elsevier Ltd
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Consejo Nacional de Ciencia y Tecnología, CONACYT: 184060, 427085/324785, CVU 567993/302713